Convert Centiinch to Perch
Convert centiinches to perches instantly. 1 centiinch = 5.050505e-5 perch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Perch to Centiinch converter for the reverse conversion.
Units explained
Centiinch
A centiinch is an Imperial unit of length equal to one hundredth of an inch (2.54×10⁻⁴ m). It is functionally identical to the caliber as a length unit but appears in different industrial contexts.
Derived from the inch via the metric-style prefix centi- (Latin centum, hundred). Standardised through the 1959 International Yard and Pound Agreement.
Centiinches occasionally appear in older engineering specifications and US-localised metric-pseudo notation. Most contemporary use prefers thousandths (mils) for sub-inch precision.
Standardised through the 1959 International Yard and Pound Agreement; rarely used in modern practice.
Perch
A perch is an Imperial unit of length identical to the rod — 16.5 feet (about 5.03 m). The names 'rod', 'perch', and 'pole' all refer to the same surveying unit and differ only by regional preference.
Like the rod, the perch derives from medieval English land-surveying. The name 'perch' was particularly common in legal land descriptions in Ireland and parts of the UK.
Perches appear in legacy land descriptions in Ireland, the UK, and historical US documents. Modern usage is rare.
Medieval English surveying origin; identical to the rod since 1620; became exact via the 1959 International Yard and Pound Agreement.
Centiinch to Perch conversion formula
The relationship between centiinches and perches:
To convert centiinches to perches, multiply the value in centiinches by 5.050505e-5. To reverse, multiply perches by 19800.
How to use this converter
Type a value into the calculator. The result in perches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Perch to Centiinch converter for the reverse direction.
Step-by-step: convert centiinches to perches
- Write down the value in centiinches (cin).
- Multiply that value by the factor 5.050505e-5.
- The product is the equivalent value in perches (perch).
- To reverse, multiply the perch value by 19800.
Worked examples
Example 1 — Convert 1 cin to perch:
1 × 5.050505e-5 = 5.050505e-5 perch
Example 2 — Convert 100 cin to perch:
100 × 5.050505e-5 = 0.0050505051 perch
Real-world example — Macro-scale buildup
A million centiinches equals exactly one perch — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.
1000000 cin × 5.050505e-5 = 50.5050505051 perch
Real-world example — Quarter-meter measurement reference
A 250,000-centiinch length equals 0.25 perches — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.
250000 cin × 5.050505e-5 = 12.6262626263 perch
Real-world example — From microscopic to macroscopic
A million centiinches equals exactly one perch. This kind of conversion appears in microfluidics, where total channel length is given in perches but feature widths are in centiinches.
1000000 cin × 5.050505e-5 = 50.5050505051 perch
Centiinch to Perch conversion table
Standard reference values for converting centiinches to perches:
| Centiinch [cin] | Perch [perch] |
|---|---|
| 0.01 | 5.050505e-7 |
| 0.1 | 5.050505e-6 |
| 1 | 5.050505e-5 |
| 2 | 0.0001010101 |
| 3 | 0.0001515152 |
| 4 | 0.0002020202 |
| 5 | 0.0002525253 |
| 10 | 0.0005050505 |
| 20 | 0.001010101 |
| 30 | 0.0015151515 |
| 40 | 0.002020202 |
| 50 | 0.0025252525 |
| 100 | 0.0050505051 |
| 500 | 0.0252525253 |
| 1000 | 0.0505050505 |
Frequently asked questions
How many perches is 1 centiinch?
How do I convert centiinches to perches?
How do I convert perches back to centiinches?
How many perches is 100 centiinches?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 cin = 5.050505e-5 perch) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.